Pile-driver attachment for rock drills



0. c. HANSEN FILE DRIYER ATTACHMENT FOR ROCK 'DRILLS Filed Feb. 20, 1926 INVENTOR a Cfianden.

(flyc- BY Z i175 TTORNEY.

Patented July 6, 1926.

UNITED- STATES -1,591,319 PATENT OFFICE.

CHARLES C. HANSEN, OF EASTON, PENNSYLVANIA, ASSIGNOR-TO INGERSOlLL-RAND OOIPANY, OF JERSEY'CITY, NEW JERSEY, A CORPORATIONDF NEW JERSEY.

FILE-DRIVER ATTACHMENT FOR ROCK DRILLS.

Application filed February 20, 1926. Serial- Np. 89,755.

This invention relates to pile drivers, but more art-icularly to a pile driver attachment or fluid actuated rock drills of the hammer type in which the driving block is of considerably smaller cross sectional area than the space in which it reciprocates.

One object of the invention is to enable the driving block to adjust its position in the attachment so that the fullest possible contact between the driving block and the end of a pile may be obtained during the drivin operation, irrespective of any relative tifising between the pile and the attachment.

Other objects will. be in part obvious and in part .pointed out hereinafter.

The invention consists of the combinations of elements and arrangement of parts having the general mode of operation substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying drawings, in which Figure 1 is an elevation, partly in section,

- of the front end of'a rock drill equipped with a pile driver' attachment constructed in accordance with the practice of the invention, taken on the line 1 1 of Figure 2 looking in the direction of the. arrows, and

Figure 2 is an elevation in section of the attachment taken through Figure 1 on the line 2-2;

Referring to the drawings, the invention is shown embodied in a fluid actuated hammer type rock drill in which a cylinder A is provided with a reciprocatory hammer piston B, only the front end of which is shown. A front cylinder washer C seals the front end of the cylinder and is bored to receive slidably an anvil block D. In this instance, the front cylinder washer C is provided with a reduced forward extension E for centralizing an attachment or front head F secured to the cylinder by suitable side bolts G arranged on opposite sides of the drill for clamping together the various parts which I comprise the casing of the drill.

' Inaccordance with the practice of the ino vention, the attachmentor front head F carries at its forward end a air of parallel projections or walls H and The walls H and J are preferably spaced at equal distances from the longitudinal axis of the rock drill to form a s ace K therebetween into which space may e inserted a pile L or other similar article to be driven. VVithin the space K is arranged a striking block 0 having a fiat forward surface P adapted to rest on the end of the pile L.v The striking block 0 is preferably of a rectangular cross sectional area and has rearwardly inclined tapered surfaces Q and R which ter mina'te at theirv small ends in a slight projection S against which the blows of the anvil block D may be delivered. The surface T of the projection S against which the blows of the anvil block D are delivered is preferably of spherical form so that a good contact may be at all times obtained between the anvil block and the surface T in stance the cheek plates are clamped firmly to said wall by means of suitable bolts V and nuts W. In order to protect the'bolts V against injury which might otherwise be caused by the blows of the striking 'block" against the cheek plates, tongues X are formed on the cheek plates to extend into suitable grooves Y formed in the wall H.

To the end that transverse movement, ofa the striking block 0 may be limited, the cheek plates U are provided with upwardl extending projections Z. The projections are so spaced with respect to each other block to tilt from the'longitudinal axis of 'that there is suflicient room for the striking the attachment within limits without binding or catching on the projections;

In the usua heretofore in use, considerable difliculty has been experienced in maintaining a full contype of pile driving devices tact between the striking block and the end of the pile. This is due chiefly to the fact that considerable clearance usually exists between the guiding means of the attachment, such as the walls, or walls and cheek plates as in the present invention, and the pile. The extreme vibration set up during operation of the machine tends to tilt the machine with respect to the pile and if the strikin ment that it is unable to adjust its position with respect to the pile, the blows may be delivered to one corner or one edge of the block is'so held within the attachpile. After a repeated ,number of blows have been delivered to one corner, a slanting surface will be formed on theend of the pile and thereafter it will be ditlicult to drive the pile in the required direction. By means of the present invention this objectionable -feature has been entirely eliminated, since the striking block may at all times adjust its position with respect to the end of the pile regardless of any relative tilting WhlC-ll may take place betweeu'thc pile and the attachment.

driving block from the front head, and

means on the cheek plates to limit transverse movement of the driving block.

2. The combination with a fluid actuated rock drill having a cylinder and a reciprocatory piston in the cylinder, of a front head having parallcl walls at its side to form a space therehetwetm, a driving block be tween said walls and of smaller width than the space to permit the striking block to tilt with respect to the longitudinal axis of the front head, cheek plates secured to one of the walls for preventing ejection of the driving block from the front head, and upwardly extending projections carried by the cheek plates to limit transverse movement of the driving block.

3. The combination with a fluid actuated rock drill having a cylinder and a reciprocatory hammer piston in the cylinder, of a front head having parallel walls at its side to form a space the-rebetween, a rectangular driving block reciprocable between said walls and of smaller width than the space to permit tilting of the driving block with respect to the hammer piston, cheek plates on one of the walls to retain the striking block in the front head, upwardly extending projections on the cheek plates to limit transverse movement of the striking block, means for securing the cheek plates in position, a groove in one wall, and tongues on the cheek plates to cooperate with the groove for protecting the securing means against the blows of the striking block.

In testimony whereof I have signed this specification. I

CHARLES C. HANSEN. 

